root@OpenWrt:/# cat /etc/config/network

config 'interface' 'loopback'
        option 'ifname' 'lo'
        option 'proto' 'static'
        option 'ipaddr' '127.0.0.1'
        option 'netmask' '255.0.0.0'

config 'interface' 'lan'
        option 'ifname' 'eth0'
        option 'type' 'bridge'
        option 'proto' 'static'
        option 'ipaddr' '192.168.1.1'
        option 'netmask' '255.255.255.0'
        option 'stp' '1'

config 'interface' 'wan'
        option 'ifname' 'eth1'
        option 'proto' 'dhcp'

config 'switch'
        option 'name' 'rtl8366s'
        option 'reset' '1'
        option 'enable_vlan' '1'

config 'switch_vlan'
        option 'device' 'rtl8366s'
        option 'vlan' '1'
        option 'ports' '0 1 2 3 5'

config 'interface' 'vpn'
        option 'server' '192.168.1.2'
        option 'username' 'test'
        option 'password' 'test'
        option 'proto' 'pptp'
        option 'defaultroute' '0'

config 'route'
        option 'interface' 'vpn'
        option 'target' '10.11.12.0'
        option 'netmask' '255.255.255.0'
        option 'gateway' '10.68.0.1'

root@OpenWrt:/#
root@OpenWrt:/# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.1.2     192.168.1.2     255.255.255.255 UGH   0      0        0 br-lan
10.68.0.1       0.0.0.0         255.255.255.255 UH    0      0        0 pptp-vpn
10.11.12.0      10.68.0.1       255.255.255.0   UG    0      0        0 pptp-vpn
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 br-lan
0.0.0.0         192.168.1.2     0.0.0.0         UG    0      0        0 br-lan
root@OpenWrt:/# uci -P /var/state show network.vpn
network.vpn=interface
network.vpn.server=192.168.1.2
network.vpn.username=test
network.vpn.password=test
network.vpn.proto=pptp
network.vpn.defaultroute=0
network.vpn.device=pptp-vpn
network.vpn.ipaddr=10.68.0.100
network.vpn.gateway=10.68.0.1
network.vpn.up=1
network.vpn.connect_time=261321
network.vpn.ifname=pptp-vpn